If you have a weak spark coming from the spark plug, lets check the ignition input voltage first. On the plug there is a green and a white wire. The White wire is a 12 volt constant. Turn the key to ignition on/run (no need to try to start it).
The I1 lead provides voltage to the AUX side (5.0 Ohm) and the Compensating side (0.5 Ohm) of the Ballast Resistor and to pin 1 of the ECM. Since there is no voltage from the igniition switch on I2, the voltage (reduced) applied to the coil is via the Compensating Resistor.
high tension coil. This increases the voltage in the secondary windings and causes a high energy spark NOTE The battery charging circuit and ignition cir- cuit are two separate systems and they op— erate independently of each other. TROUBLE SHOOTING If no spark occurs at spark plug, perform the follow-
A pin within the coil body skewers the lead. If the pin does not contact the wire core, there will be no continuity. The coil will often have enough available voltage to jump the gap, so you see spark. The internal arcing that occurs within the high-tension lead will eventually create enough resistance that ignition system performance will suffer.
The coil is supplied with 12 volts when the charge_time has passed after the TDC signal from the distributor/crank sensor. It begins to charge. It begins to charge. When a further time equal to coil_dur has passed, the current to the coil is shut off, and a spark is produced.
You could have a bad coil -- only way to tell is to use a peak voltage adapter with the meter or a meter that will read peak volts. -- the G/Y wire of the coil to ground should have over a 100 Volts on it, when using a meter that will read peak volts to test it. The coil has 12 VDC on it all the time with the key on -- the PCM pulses the G/Y ...
Oct 17, 2018 · If it's bad, you'll get a weak spark or no spark at all. To test the coil's secondary winding, attach the test probes to the outer 12-volt pole on the coil and the center pole (where the main wire goes to the distributor). The 12-volt pole is the spot where the power comes into your coil.
1. Connect a 12 volt test light from the black coil wire to ground (engine case). 2. Rotate the engine until the front cylinder is on the compression stroke. 3. Remove the crank case timing hole plug. 4. Turn ignition on. 5. While holding the rotor in the advance position with the fly weights against their stops